A pesticide surface water mobility index and its relationship with concentrations in agricultural drainage watersheds

摘要

An index to benchmark pesticide mobility relevant to surface water runoff and soil erosion(surface water mobility index, or SWMI) was derived based on two key environmental fate parameters: Degradation half-life and organic carbon-normalized soil/water sorption coefficient(K_oc). Values assigned with the index of each individual compound correlate well with the concentration trend of 13 pesticides monitored in six Lake Erie, USA, tributaries from 1983 to 1991. Regression using a power function of SWMI fits concentration data well at various percentiles in the database for each tributary and all six tributaries combined, with r~2 ranging from 0.71 to 0.94 for the concentrations at the 95th percentile.